Word Study
spying (root: spy)
THESAURUS
spying
bugging, cloak-and-dagger work, counterespionage, counterintelligence, detection, electronic surveillance, espial, espionage, following, intelligence, intelligence work, looking, lookout, military intelligence, note, notice, observance, observation, regard, respect, secret police, secret service, shadowing, stakeout, surveillance, tailing, trailing, viewing, watch, watching, wiretap, wiretapping, witnessingFor further exploring for "spying" in Webster Dictionary Online